bodge



(No. Model.)

J. G. BODG'E. MACHINE FOR FORMING HOLLOW WARE FROM PAPER PULP. No. 293.2 20.

Paten-te d Feb. 12,. 1884 u w I I VU-Lt-ngs65:

; UNITED STATES ATENT OFFICE.

JOSEPH G. BODGE, OF \VATERVILLE, MAINE.

MACHINE FOR FORMING HOLLOW WARE FROM PAPER-PULP.

SPECIFICATION forming part of Letters Patent No. 293,220, dated February 12, 1884.

Application filed June 19. 1993. No model.) I

Improvements in Machines for Forming H01- low Viare from Paper-Pulp, of which the following is a specification, reference being had therein to the accompanying drawings; My invention relates to machines and methods for forming hollow ware, such as pails, &c., 'from wood pulp or other paper-stock; and the object of my invention is to provide a machine by which such ware may beformed with a laminated structure, and a heavy hydraulic pressure be immediately applied upon all parts of the surface of the formed article i in such a way as to strengthen and consolidate it.

I regard my present invention as a varia' tion of my machine for forming hollow ware as shown by my application for Letters'Patent filed April 2, 1883, the same general principles being applied in each case.

Figure l of my drawings shows vertical section of my machine as seen when the pail has been formed but not taken from the machine. Fig. 2 shows half-section and half-elevation through the plunger.

A is a cylinder, open at the top and having on its. lower-edge a flange. To this flange is bolted the flange of the male die or former B- and the plate 6, which forms the bottom of the cylinder. The male die 13 consists of a stout perforated shell, the outside of which is the shape of the article to be formed. It is of considerably less diameter than the inside of the cylinder A,and its lower edge is flanged andsecured to the cylinder A, as described. Passing through the plate 0 is the pipe cwith its valve 0. The outside surface of the former B is covered with a felt or other porous drainer, D. E represents the pail after being formed.

F isa plunger, which is made to fittightly in the cylinder A by means of the packingring f. The plunger F 'andits interior are formed into a perforated female die, F, similar to the male die described. The interior of this female die F opens downward. The inside diameter of dieF is considerably greater than the outside of the pail after being formed.

The female die F may be made a part of the plunger F, or it may becast separately and bolted to it. The space between the outside surface of the die F and the inside surface of the cylinder F forms a closed chamber, from the bottom of which leads the pipe H with its valve 71-. The top-of the plunger F contains a sweep or arm l, by which it can be raised from the cylinder to the positionshown in Fig. 2, or lowered into it, as shown in Fig. 1. The inside surface of the female die F is lined with the rubber bag J, the lower end of which is secured around the plunger F by means of the ring K, bolted to the end of the plunger by the bolts 7:. The bag J, which is the same shape as the inside of the die F, should be molded of about the size of the outside of the formed pail after the latter has been compressed. It will therefore be some- .what smaller than the inside surface of the der A, or it may be forced in by means of a pipe. The plunger F is then lowered into the cylinder A, and at the same time suction is applied through the pipe H, thus exhausting the air in the chamber L. The atmospheric pressure which will then be exerted on the under side of the rubber bag J will cause it to expand against the inside surface of the die F. This same result may be obtained by the back pressure of the pulp against the rubber ,loweredfthewatcr of the pulp is forced through the felt drainer D and the perforated'former B, depositing the fiber of a uniform thickness over the surface of the drainer D. The bag J being drawn away, from the surface of the forming-pail allows the water to pass freely through the drainer at all points, thus securing uniformity of thickness. As soon as the plunger begins to descend, suction is applied to the pipe 0, and the water is drawn off as fast as it passes through the former B. As soon as the plunger F has reached the bottom of the cylinder A, water is forced .into. the chamber L through the pipe H. As soon as the suction through pipe His stopped, the bag J immediatelycollapses to its form as molded around the outside of the formed pail. The water enters the chamber L, and, passing through the perforations in the female die F, surrounds the bag J,which incloses the pail F. Hydraulic pressure is now applied and the rubber bag is forced against the surface of the pail, squeezing out the water and compressing the pulp. Any desired pressure may be applied to the surface of the pail, according to the thickness of the article and the degree of hardness desired. It will be noted that by my process the pressure is applied at all points of-thesurfacein a direction at right angles to the surface, so that the laminated structure of the material is not disturbed. Pressure applied in any other manner breaks up the lamination and destroys the strength of the material. Pipe 0 may be omitted and the bottom of cylinder A left open.

I claim 1. The machine for forming hollowware from wood pulp, consisting of the cylinder A, containing the perforated male die or former D, combined with the plunger F, containing female die F, chamber L, rubber bag J, and 5 female die F, lined with the rubber bag J, 40

formed smaller than the female die, combinedwith the chamber L and pipe H, by means of which the bag J may be held away from the forming pail and'by a hydraulic pressure afterward applied, substantially as shown and described.

3. The process of forming hollow ware from wood'pulp on the outside of a perforated male die, consisting of lowering over the male die a female die lined with a rubber bag, which bag is expanded away from the forming article by suction or otherwise, and after the article is formed allowing the bag to collapse and immediately applying a hydraulic pressure, substantially as described and shown.

4. The process of forming hollow ware on the outside of amale die, consisting'of forcing over it a female die of larger-diameter lined with a rubber-bag, and applying aheavy hydraulic pressure on the outside of said bag as soon as the article is formed, substantially as shown and described.

In testimony whereof I aiiix mysignature in presence of two witnesses.

JOSEPH G.

BODGE. YVit-nesses S. WV. Barns,

H. D. Barns. 

